The price of sugar is reduced by 20%. Now a person can buy 500g more sugar for Rs.36. The original price of the sugar per kilogram was

Let the original price of sugar = x /kg.
Reduced price of sugar = 80% of x

$ = \frac{X\times80}{100}$ = $\frac{4}{5}$

$x = 9 × 2 = 18$/Kg

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